Computer Science
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..108n&link_type=abstract
NOAO Proposal ID #2000A-0108
Computer Science
Scientific paper
We propose to carry out deep, multicolor, MOSAIC II imaging of 5 nearby (z < 0.1) clusters which will be used to measure the weak lensing shear toward these galaxy clusters. We will use the color information to separate cluster and background galaxies. When combined with the relative insensitivity of the lensing signal towards low redshift clusters to the background galaxy redshift distribution, we will eliminate a major source of uncertainty present in previous lensing mass determinations. These 5 clusters - in addition to 9 already observed at CTIO - are part of a complete X-ray luminosity-limited sample of 18 nearby southern clusters scheduled for Sunyaev-Zel'dovich (SZ) observations by the Viper telescope. We will combine this lensing data with extensive X-ray and radio data, optical redshifts, and high- quality SZ observations now available of these clusters to perform detailed studies of their baryon fraction, morphologies, as well as, obtaining determinations of their total masses. These 14 clusters - more than 3/4 of the total sample - will be a major step towards a robust determination of the local cluster mass function, a fundamental goal of cosmology.
Fischer Phillippe
Frieman Joshua
Joffre Michael
McKay Timothy
Mohr Joseph
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